my_function(<<END, <<END . <<END);
a
END
b
END
c
END

##</code><code>##

my_function("a\n", "b\n" . "c\n");

##</code><code>##

my_function(<<A, <<B . <<C);
a
A
b
B
c
C

##</code><code>##

printf <<'END', 1, 2,
%d %d %d %d
END
3, 4;